Monitoring coastal morphology: the potential of low-cost fixed array action cameras for 3D reconstruction
Monitoring coastal morphology: the potential of low-cost fixed array action cameras for 3D reconstruction
复制标题
DOI：
10.1002/esp.4892
复制
发表时间：
2020-06-10
影响因子：
3.3
通讯作者：
Plater, Andrew
中科院分区：
文献类型：
--
作者：
Godfrey, Samantha;Cooper, James;Plater, Andrew
运动恢复结构与多视点立体摄影测量相结合已成为海岸带环境监测和三维重建的一种日益流行的方法。气候变化正在推动沿海向陆地退缩的可能性增加，这意味着使用SfM-MVS等方法进行地貌监测对于检测和跟踪影响至关重要。SfM-MVS已经在各种平台和空间和时间分辨率下进行了很好的研究，主要使用沿海环境中的直线数码相机。然而，一直没有评估的潜力，固定的多相机阵列，以监测向陆撤退或相机的位置相对于现场的意义。本研究提出了一种创新的图像采集方法，使用专用的相机网格和GoPro（c）动作相机来评估相机高度，高度和重叠的综合影响，在一个已知的向陆地撤退的网站。该方法研究了摄像机位置对场景重建的影响，为多摄像机阵列的设计提供了依据。与同等地面激光扫描相比，SfM-MVS密集点云显示出毫米级的精度，以及内部精度估计< 3毫米的强大图像网络几何结构。初步结果表明，在悬崖与相机的比例为3：4.18和相机倾斜度为40度的情况下，只需五幅图像就可以提供毫米范围内的重建（平均误差为4.79 mm）。这些发现说明了使用多个摄像机时摄像机位置的重要性，并有助于设计一种低成本，固定的多摄像机阵列，用于小规模的向陆撤退的网站。(c)2020作者出版社：John Wiley & Sons Ltd
The combination of structure-from-motion with multi-view stereo (SfM-MVS) photogrammetry has become an increasingly popular method for the monitoring and three-dimensional (3D) reconstruction of coastal environments. Climate change is driving the potential for increased coastal landward retreat meaning geomorphological monitoring using methods such as SfM-MVS has become essential for detecting and tracking impacts. SfM-MVS has been well-researched with a variety of platforms and spatial and temporal resolutions using mainly rectilinear digital cameras in coastal settings. However, there has been no assessment of the potential of fixed multi-camera arrays to monitor landward retreat or on the significance of camera placement in relation to the scene. This study presents an innovative method of image acquisition using a purpose-built camera grid and GoPro (c) action camera to evaluate the combined effects of camera height, obliqueness and overlap at a site of known landward retreat. This approach examines the effect of camera placement on scene reconstruction to aid the design of a multi-camera array. SfM-MVS dense point clouds display millimetre accuracy when compared to equivalent terrestrial laser scans and strong image network geometry with internal precision estimates of < 3 mm. Comparable point cloud reconstruction can be achieved with a small number of images stationed in appropriate positions. Initial results show as few as five images positioned at a cliff to camera ratio of 3:4.18 and camera obliqueness of 40 degrees can provide reconstruction in the range of millimetres (mean error of 4.79 mm). These findings illustrate the importance of camera placement when using multiple cameras and aid the design of a low-cost, fixed multi-camera array for use at sites of small-scale landward retreat. (c) 2020 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd